Pump jack



J. M. STONE. PUMPJACK.

- APPLICATION FILED JUNE 21, 192i. I 1,433,571. Patented Oct. 31, 1922.

2 SHEETS-SHEEI l.

.l. M. STONE.

PUMP JACK- APPLICATION FILED JUNEZI. I921.

1,43 3,571 Patented Oct. 31, 1922.

2 SHEETS-SHEET 2.

- amen (oz w Msfiama FATE JOHN M. STONE, OLE CARRIED SPRING-S, TEXAS.

PUMP

Application filed June 21,

To all whom. it may concern Be it known that 1, JOHN M. SroNn, a citizen of the United States, residing at Carrizo Springs, in the county of Dimmit and State of Texas, have invented certain new and useful. Improvements in Pump Jacks,'of which the following is afull, clear, and exact description.

My invention relates to pump jacks, and has for its object to provide such a device in which friction is reduced to a minimum and one which will require very little, if any, attention.

Another object of the invention is to provide such a device which is made of very few parts and yet is extremely durable in operation and withstands the heavy strain to which such devices are put.

Another object of the invention is to provide a pump jack in which all bearing surfaces are provided with a special type of roller bearing, the bearings being rendered dust-proof by means of felt washers.

Other objects and advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawing, in which:

Figure 1 is a side elevation of the pump jack, portions being shown in section.

Figure 2 is a perspective view of the pump jack. N

Figure 3 is a side elevation. at right angles to Figure 1, parts being shown in section.

Figure 4 is a horizontal section through the eccentric showing the main shaft in elevation.

Figure 5 is an enlarged perspective view of one of the roller bearings; and

Figure 6 is an enlarged section through the eccentric.

Referring to the drawing more in detail, the numeral 1. designates the s1iperstrm-ture or tower for the pump jack and related parts. The main shaft 52 is mounted on the superstructure l. and is positioned in the bearings 3 which are fixed to the superstructure by means of the staples l. Fixed on the main shaft 2 is an eccentric 5 which co-operates with the eccentric strap 6 in the usual manner. Also carried by the main shaft 2 is a pulley 7 which is operated by means of a belt extending from pulley Son the drive shaft 9.

On the brace member 10 is mounted a.

JACK.

1921. Serial no, 4.79304.

plate 11 provided with slotted guide bars 12 for the rod 13. The pump or sucker rod 14; extends through openings in the brace 10 and plate 11 and is guided thereby. The rod 13 may be provided with an enlarged bearing surface for thestrap 15; the bearing, of course, being provided with antifriction rollers. Bolts and washers 16 and 17, respectively, hold rod 13 in proper position. Brace rods 18 are secured to the eccentric strap 6 and strap 15, as shown in the drawing. Bolts 16 also provide anchors for the two tension springs 19 which are suitably secured at their upper ends to the tower 1. Spacing sleeves 20 and 21 are located on shaft 2 for the purpose of properly positioning the pulley and eccentric. The eccentric 5 is provided with a plurality of openings 22 at different distances from the center thereof so to vary its throw The four bearing surfaces shown are provided with tri-roller bearings 23, as shown in Figure 5. Each of these rollers is provided with three bearing surfaces 2%. These rollers are provided with projections 25 and may be placed in a cage, as is common in roller bearing constructions.

As shown in Figure 6 of the drawing, the roller bearings are provided with dust-proof washers 26 clamped in place by rings 27 and bolts 28. It will thus be seen that I have provided an eccentric in which friction is reduced to a minimum and which is practically dust-proof and will require very little attention.

By the use of the springs 19 the excess energy on the down stroke is transferred to the up stroke of the pump rod. Where a double acting pump is used these springs may be removed.

In accordance with the patent statutes, I have described what I now believe to be the best embodiment of the invention, but I do not wish to be understood thereby as limiting myself or the scope of the invention, as many changes and modifications may be made without departing from the spirit of the invention; all such I aim to include in the scope of the appended claims. I

What I claim as new and desire to secure by Letters Patent is:

l. A device of the class described comprising a shaft, an eccentric thereon, a strap for said eccentric, a'nthfrictiou bearings be tween said ecrentric and strap, and washers secured to said strap and bridging the space between the eccentric and strap.

2. A device .of the class described coin- 5 prising a shaft, an eccentric thereon, a strap for said eccentric, anti-friction bearings between said eccentric and strap, Washers on opposite sides of said strap and bridging the space between the eccentric and strap, rings in contact With said vgshers, and 10 means extending through said rings iwashers and eccentric strap for clamping said parts together. JOHN M. STONE 

